Mercury Cougar Owners banner

1 - 7 of 7 Posts

·
Registered
Joined
·
88 Posts
Discussion Starter #1
I have a '68 Cougar with a 302 2bbl engine from 1974. I was wondering if it would be ok to run (87) grade octane gas (regular) in the car. I've been using (89) grade gas which is the medium stuff, but as we all know, gas prices are rapidly climbing, so I don't want to be using the more expensive gas if not needed.

Thanks,
Nate
 

·
Registered
Joined
·
210 Posts
check your owners manual.

never mind just noticed it wasnt original motor.
 

·
Contributing Member
Joined
·
6,137 Posts
i disagree. You have a low compression engine and you'll be fine with 87 octane. If you're not experiencing any pinging, there is no benefit to higher octane.
x2........
 

·
Registered
Joined
·
391 Posts
I run 87 octane in my '68 289 (2V), which has been rebuilt with hardened valve seats but is otherwise mostly original (no overbore). It runs just great on 87 octane, even when it's oxygenated (which they do to us here in CA every winter). I also have a 302 (2V) with a mild cam that also runs fine in 87 octane. Gas mileage with modern gas is not so great, though. Oh well.
 

·
Registered
Joined
·
88 Posts
Discussion Starter #7
Thank you! I've heard to look out for the pinging, haven't heard it yet with the 89 grade, so I'd like to kick it down to 87 and see what happens.

Thanks again!
Nate
 
1 - 7 of 7 Posts
Top